Sharpener.



J. M. LENZ & T. E. REGAN.

SHARPENER.

APPLICATION FILED JUNE 6, l9l6-.

Patented Aug. 29, 1916.

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JOHN M. LENZ AND TIMOTHY E. REGAN, OF GRAND ISLAND, NEBRASKA.

SHARPENER.

Application filed. June 6, 1916.

To all whom it may concern:

Be it known that we, J HN M. LENZ and TIMOTHY E. REGAN, citizens of theUnited States, residing at Grand Island, in the county of Hall and Stateof Nebraska, have invented new and useful Improvements 1n Sharpeners, ofwhich the followlng 1s a specification.

The invention relates to an improved sharpener, designed to beconstructed as an entirety and adapted primarily for application to asewing-machine, or like devlce.

The sharpener embodies a member having means to permit it to beadjustably connected to a fixed shaft of the sewmg machine, in suchposition that a drlvmg shaft, carried by the device, may be operated bya belt connection or frictional contact wlth a rotating element or wheelof the machine, the driving shaft carrying a sharpening or polishingdisk or wheel.

The invention in the preferred form of details, will be described in thefollowing specification, reference being had partlcularly to theaccompanying drawmgs, 1n which:

Figure 1 is a front elevation, illustrating the applicaion of theimprovement to a sewing-machine; Fig. 2 is a perspectlve new of theimprovement. Fig. 3 is a broken vertical section through the frame bar,illustrating the clamping means.

In detail structure, as will be plain from the accompanying drawings,the improved attachment includes a frame bar 1, transversely in which ismounted in an appropriate manner, a driving shaft 2. On one end of thisshaft is removably mounted a sharpening or polishing disk or Wheel 3,and on the opposite end a friction pulley l.

At one end of the frame bar is provided a means for clamping the devicein place, and the opposite end of the bar is covered to the desiredextent by a protecting strip 5, which will permit the said end of thebar to rest upon the machine top or table without 1njury to the latter.

At the clamping end of the bar, the latter is formed with a channel 6,extending longltudinally thereof and opening through the end of the-bar.The channel does not ex tend entirely through the bar, but a slot 7 isformed in the base of the channel to extend through the bar, the slot 7being of less 1 length and width, than the similar dimensions of thechannel.

Specification of Letters Patent.

Patented Aug. as, m1 6.

Serial no. 101,992.

Theclamping means includes a block 8 slidably mounted in the channel,and having a rod 9 threaded therethrough. The ends of the rod onrespective sides of the block are reversely threaded as at 10, and 11,and mounted on these threaded portions are clamping jaws 12, and 13,which by turning the rod, may be adjusted toward and from each other inan obvious manner. The rod may be provided with a head or fixed nut 14,by which it may be operated to adjust the jaws. The block 8 is threadedto receive the shank of a thumb screw 15, the said shank passing throughthe slot 7, and there being provided with a washer 16, between the headof the thumb screw and the adjacent surface of the frame bar. Throughthe obvious use of the thumb screw the blocks may be locked in anydesired position longitudinally of the channels within limits of theslot.

In application, the device is applied to the shaft of the balance wheelof a sewing machine or the like, through the clamp described, theadjustment of the clamp longitudinally of the bar being such that whenin this position the grooved pulley 4 will frictionally bear upon theperiphery of said balance Wheel, so that the shaft 2 is operated by saidwheel. By this means, the polishing or grinding disk 3 is driven topermit polishing, grinding or other treatment of any edge tools or otherdevices.

While the device is designed for application with any and all types ofsewing machines, it is adapted particularly for that class of machinesin which through the adjustment of a nut the balance Wheel and itsdriving element may be free from the operating shaft of the sewingmachine mechanism, in order for example that the bobbin winding wheel orthe like may be operated for winding the bobbin without actuating theneedle bar, etc., of the sewing mechanism, Following the loosening ofthis clamp nut to free the balance wheel the clamp of the improvedsharpener is applied to such clamp nut.

Having described our invention, what we desire to secure by LettersPatent is 1. A sharpener structure designed to be applied to a sewingmachine, including a frame bar, a clamp carried thereby to em gage ashaft of the machine, a driving sho ft carried by the frame bar, apulley carried by the shaft to frictionally engage the 1'0- tating partof the machine, and a grinding the shaft, and an operating disk carriedby disk secured on the shaft. the shaft. 2. A device of the classdescribed, inciud- In testimony whereof we aflix our signa- 10 7 ing aframe bar, a clamp adj ustably mounted tures.

5 in one end of the frame bar, an operating shaft mounted in the framebar, beyond the JOHN M. LENZ. clamp, a friction driving means carried byTIMOTHY E. REGAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patentl,-

Washington, D. G.

